Aluminum alloy bodywork welding deformation flame correction method

Abstract

The invention discloses an aluminum alloy bodywork welding deformation flame correction method, which is characterized by comprising the following steps of: adjusting a baking gun with a middle blue fire length of 10 to 14 millimeters; uniformly heating a welding seam by using blue fire tip at a heating speed of 50 to 90 centimeters per minute; controlling the heating temperature to be between 120 and 200 DEG C; and cooling the welding seam. The method has very good application effect in production, reduces the welding deformation correction frequency, reduces the production cost, improves the production efficiency, improves the welding quality, fills the blank of aluminum alloy welding correction technology, and lays a technical foundation for large-batch aluminum alloy vehicle production. After aluminum alloy welding pieces of plates with lengths of 300 millimeters and different thicknesses are corrected twice by adopting the flame correction process, influence on strength is inspected. The results show that the matrix strength of the experimental piece corrected by adopting flame is reduced by about 2 to 3 percent compared with the strength of the aluminum alloy welding piece without adopting the flame correction, so the method meets the aluminum alloy welding strength and integrally ensures the technical object of 60 percent of base material matrix length.

Description

technical field

[0001] The invention belongs to the field of aluminum alloy vehicle body manufacturing, and in particular relates to a flame repairing method for welding deformation of a vehicle body. Background technique

[0002] The welding deformation and residual stress accompanying the welding process are important factors affecting the accuracy and performance of welding products, and are still important issues that need to be solved urgently in industrial production. Since the expansion (or contraction) rate of aluminum when heated (or cooled) is about twice that of steel, the volume shrinkage rate of pure aluminum reaches 7% when crystallized, and the shrinkage rate of aluminum alloy reaches 5% on average. Therefore, in When welding aluminum alloy components, the problem of instability and deformation after welding is particularly prominent.

[0003] With the widespread application of aluminum alloy welded components, the research on aluminum alloy welding deformati...